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264<li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
265<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
266<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
267</ul>
268</li>
269</ul>
270<ul>
271<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
272<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
273<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
274</ul>
275</li>
276</ul>
277<ul>
278<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
279<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
280<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
281<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
282<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
283<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
284<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
285<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
286<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
287<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
288<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
289<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
290<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
291<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
292<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
293<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
294<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
295<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
296<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
297<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
298<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
299<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
300<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
301<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
302<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
303<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
304<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
305</ul>
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310<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
311<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
312<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
313<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
314<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
315<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
316<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
317<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
318<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
319<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
320<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
321<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
322<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
323<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
324<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
325<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
326<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
327<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
328<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
329<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
330<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
331<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
332<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
333<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
334<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
335<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
336<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
337<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
338<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
339<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
340</ul>
341</li>
342</ul>
343<ul>
344<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
345<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
346<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
347<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
348<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
349<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
350<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
351<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
352<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
353<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
354<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
355<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
356<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
357<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
358<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
359</ul>
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363<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
364<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
365<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
366<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
367<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
368<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
369<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
370<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
371<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
372<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
373<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
374<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
375<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
376<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
377<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
378<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
379<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
380<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
381<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
382<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
383<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
384<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
385</ul>
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423 <div role="main" class="document">
424
425 <div class="section" id="upgrading-from-a-previous-version">
426<h1>Upgrading From a Previous Version<a class="headerlink" href="#upgrading-from-a-previous-version" title="Permalink to this headline">¶</a></h1>
427<p>Please read the upgrade notes corresponding to the version you are
428upgrading from.</p>
429<div class="toctree-wrapper compound">
430<ul>
431<li class="toctree-l1"><a class="reference internal" href="upgrade_3110.html">Upgrading from 3.1.9 to 3.1.10</a></li>
432<li class="toctree-l1"><a class="reference internal" href="upgrade_319.html">Upgrading from 3.1.8 to 3.1.9</a></li>
433<li class="toctree-l1"><a class="reference internal" href="upgrade_318.html">Upgrading from 3.1.7 to 3.1.8</a></li>
434<li class="toctree-l1"><a class="reference internal" href="upgrade_317.html">Upgrading from 3.1.6 to 3.1.7</a></li>
435<li class="toctree-l1"><a class="reference internal" href="upgrade_316.html">Upgrading from 3.1.5 to 3.1.6</a></li>
436<li class="toctree-l1"><a class="reference internal" href="upgrade_315.html">Upgrading from 3.1.4 to 3.1.5</a></li>
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440<li class="toctree-l1"><a class="reference internal" href="upgrade_311.html">Upgrading from 3.1.0 to 3.1.1</a></li>
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443<li class="toctree-l1"><a class="reference internal" href="upgrade_305.html">Upgrading from 3.0.4 to 3.0.5</a></li>
444<li class="toctree-l1"><a class="reference internal" href="upgrade_304.html">Upgrading from 3.0.3 to 3.0.4</a></li>
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451<li class="toctree-l1"><a class="reference internal" href="upgrade_221.html">Upgrading from 2.2.0 to 2.2.1</a></li>
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453<li class="toctree-l1"><a class="reference internal" href="upgrade_214.html">Upgrading from 2.1.3 to 2.1.4</a></li>
454<li class="toctree-l1"><a class="reference internal" href="upgrade_213.html">Upgrading from 2.1.2 to 2.1.3</a></li>
455<li class="toctree-l1"><a class="reference internal" href="upgrade_212.html">Upgrading from 2.1.1 to 2.1.2</a></li>
456<li class="toctree-l1"><a class="reference internal" href="upgrade_211.html">Upgrading from 2.1.0 to 2.1.1</a></li>
457<li class="toctree-l1"><a class="reference internal" href="upgrade_210.html">Upgrading from 2.0.3 to 2.1.0</a></li>
458<li class="toctree-l1"><a class="reference internal" href="upgrade_203.html">Upgrading from 2.0.2 to 2.0.3</a></li>
459<li class="toctree-l1"><a class="reference internal" href="upgrade_202.html">Upgrading from 2.0.1 to 2.0.2</a></li>
460<li class="toctree-l1"><a class="reference internal" href="upgrade_201.html">Upgrading from 2.0 to 2.0.1</a></li>
461<li class="toctree-l1"><a class="reference internal" href="upgrade_200.html">Upgrading from 1.7.2 to 2.0</a></li>
462<li class="toctree-l1"><a class="reference internal" href="upgrade_172.html">Upgrading from 1.7.1 to 1.7.2</a></li>
463<li class="toctree-l1"><a class="reference internal" href="upgrade_171.html">Upgrading from 1.7.0 to 1.7.1</a></li>
464<li class="toctree-l1"><a class="reference internal" href="upgrade_170.html">Upgrading from 1.6.3 to 1.7.0</a></li>
465<li class="toctree-l1"><a class="reference internal" href="upgrade_163.html">Upgrading from 1.6.2 to 1.6.3</a></li>
466<li class="toctree-l1"><a class="reference internal" href="upgrade_162.html">Upgrading from 1.6.1 to 1.6.2</a></li>
467<li class="toctree-l1"><a class="reference internal" href="upgrade_161.html">Upgrading from 1.6.0 to 1.6.1</a></li>
468<li class="toctree-l1"><a class="reference internal" href="upgrade_160.html">Upgrading from 1.5.4 to 1.6.0</a></li>
469<li class="toctree-l1"><a class="reference internal" href="upgrade_154.html">Upgrading from 1.5.3 to 1.5.4</a></li>
470<li class="toctree-l1"><a class="reference internal" href="upgrade_153.html">Upgrading from 1.5.2 to 1.5.3</a></li>
471<li class="toctree-l1"><a class="reference internal" href="upgrade_152.html">Upgrading from 1.5.0 or 1.5.1 to 1.5.2</a></li>
472<li class="toctree-l1"><a class="reference internal" href="upgrade_150.html">Upgrading from 1.4.1 to 1.5.0</a></li>
473<li class="toctree-l1"><a class="reference internal" href="upgrade_141.html">Upgrading from 1.4.0 to 1.4.1</a></li>
474<li class="toctree-l1"><a class="reference internal" href="upgrade_140.html">Upgrading from 1.3.3 to 1.4.0</a></li>
475<li class="toctree-l1"><a class="reference internal" href="upgrade_133.html">Upgrading from 1.3.2 to 1.3.3</a></li>
476<li class="toctree-l1"><a class="reference internal" href="upgrade_132.html">Upgrading from 1.3.1 to 1.3.2</a></li>
477<li class="toctree-l1"><a class="reference internal" href="upgrade_131.html">Upgrading from 1.3 to 1.3.1</a></li>
478<li class="toctree-l1"><a class="reference internal" href="upgrade_130.html">Upgrading from 1.2 to 1.3</a></li>
479<li class="toctree-l1"><a class="reference internal" href="upgrade_120.html">Upgrading from 1.1 to 1.2</a></li>
480<li class="toctree-l1"><a class="reference internal" href="upgrade_b11.html">Upgrading from Beta 1.0 to Beta 1.1</a></li>
481</ul>
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